from flask import render_template, session, current_app, g, abort, jsonify, request

from info import constants, db
from info.models import User, News, Comment, CommentLike
from info.modules.news import news_blu
from info.utils.commom import user_login_data
from info.utils.response_code import RET


@news_blu.route("/followed_user",methods =["POST"])
@user_login_data
def followed_user():
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="未登录")

    # 取到参数
    user_id = request.json.get("user_id")
    action = request.json.get("action")

    if not all([user_id,action]):
        return jsonify(errno = RET.PARAMERR,errmsg = "参数错误")
    if action not in("follow","unfollow"):
        return jsonify(errno = RET.PARAMERR,errmsg="参数错误")

    try:
        other = User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno = RET.DBERR,errmsg = "数据查询错误")

    if not other:
        return jsonify(errno = RET.NODATA,errmsg = "未查询到数据")
    # 根据要执行的操作取修改对应的数据
    if action =="follow":
        if other not in user.followed:
            # 当前用户的关注列表添加一个值
            user.followed.append(other)
        else:
            return jsonify(errno = RET.DATAEXIST,errmsg = "当前用户已经被关注")
    else:
        # 取消关注
        if other in user.followed:
            user.followed.remove(other)
        else:
            return jsonify(errno = RET.DATAEXIST,errmsg = "当前用户未被关注")

    return jsonify(errno = RET.OK,errmsg = "操作成功")



@news_blu.route("/comment_like",methods=["POST"])
@user_login_data
def comment_like():
    """
    给评论点赞
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR,errmsg = "用户未登录")
    #取到请求参数
    comment_id = request.json.get("comment_id")

    action = request.json.get("action")

    if not all([comment_id,action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in("add","remove"):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        comment_id = int(comment_id)

    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not comment:
        return jsonify(errno=RET.NODATA, errmsg="评论不存在")

    if action =="add":
        comment_like_model = CommentLike.query.filter(CommentLike.comment_id==comment_id,CommentLike.user_id==user.id).first()
        if not comment_like_model:
            comment_like_model = CommentLike
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)
            #更新点赞次数
            comment.like_count +=1

    else:
        #取消点赞评论
        comment_like_model = CommentLike.query.filter(CommentLike.user_id==user.id,CommentLike.comment_id==comment.id).first()

        if comment_like_model:
            db.session.delete(comment_like_model)
            #更新点赞次数
            comment.like_count -= 1

    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据库操作失败")
    return jsonify(errno=RET.OK, errmsg="OK")



@news_blu.route("/news_comment",methods=["POST"])
@user_login_data
def comment_news():
    """
    评论新闻或者回复某条新闻下指定的评论
    判断有哦没有登录，
    接受参数，新闻id,
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    # 取到请求参数
    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment_content") # 需要保存到数据库中
    parent_id = request.json.get("parent_id")  # 这时回复父评论的 父评论的id

    #判断参数
    if not all([news_id,comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    # 从数据库中查询新闻，判断新闻是否存在
    try:
        news =News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")

    # 到这一步意味着查出来了，需要把他添加到数据库中去
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    #添加到数据库
    # 为什么要自己去添加commit()?因为在return的时候需要用到comment的id

    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()

    return jsonify(errno = RET.OK,errmsg = "OK",data = comment.to_dict())





@news_blu.route("/news_collect",methods = ["POST"])
@user_login_data
def collect_news():
    """
    收藏新闻
    1.接收参数
    2.判断参数
    3.查询新闻，并判断新闻是否存在
    :return:
    """
    # 接受新闻id,和action里边包括在收藏列表，和不在，
    #  user= g.user. 判断存不存在，
    #判断参数全不全，在判断传过来的新闻id是否是整数，
    #在去从数据库中取出来看看有没有这个新闻
    #在判断有没有收藏，
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")
    #1.接受参数
    news_id = request.json.get("news_id")
    action = request.json.get("action")
    # 2 校验参数
    if not all([news_id,action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    if action not in ["collect","cancel_collect"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    #检验参数，传过来的news_id必须是int类型
    try:
        news_id = int(news_id)
    except Exception as e :
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 从数据库中查出看看有咩有这个 新闻，会出现2 种报错，news_id 格式不对
    #和数据库中，没有查询到这个新闻
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")

    #收藏以及取消收藏
    if action == "cancel_collect":
        #取消收藏
        if news in user.collection_news:
            user.collection_news.remove(news)
    else:
        if news not in user.collection_news:
            # 添加到用户的新闻收藏列表
            user.collection_news.append(news)
    return jsonify(errno=RET.OK, errmsg="操作成功")



@news_blu.route("/<int:news_id>")
@user_login_data
def news_detail(news_id):
    """
    新闻详情
    :param news_id:
    :return:
    """
    #查询用户登录信息
    user = g.user
    # 右侧的新闻排行的逻辑
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)
    #定义一个空的字典列表
    news_dict_li = []
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())

    # 右边排序的详情数据
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)

    if not news:
        abort(404)

    news.clicks += 1
    is_collected = False

    if user:
        # 判断用户是否收藏当前新闻，如果收藏：
        # collection_news 后面可以不用加all，因为sqlalchemy会在使用的时候去自动加载
        if news in user.collection_news:
            is_collected = True

    #去查询评论数据
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    comment_like_ids = []
    if g.user:
        try:
            # 查出所有评论的id
            comment_ids = [comment.id for comment in comments]
            # 查出当前评论中哪些评论被当前用户点赞
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),CommentLike.user_id==g.user.id).all()
            # 取到所有被点赞的评论的id 第2步查询出来是一个【CommentLike】
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_li = []
    for comment in comments:
        comment_dict = comment.to_dict()
        comment_dict["is_like"] = False
        #判断当前遍历到的评论是否被当前登录用户所带你咱
        if comment.id in comment_like_ids:
            comment_dict["is_like"] = True
        comment_dict_li.append(comment_dict)

    is_followed = False
    # if 当前新闻有作者，并且 当前登录用户已关注过这个用户
    if news.user and user:
        # # if user 是否关注过 news.user
        if news.user in user.followed:
            is_followed = True





    data = {
        "user":user.to_dict() if user else None,
        "news_dict_li":news_dict_li,
        "news":news.to_dict(),
        "is_collected":is_collected,
        "comments":comment_dict_li,
        "is_followed":is_followed
    }
    return render_template("news/detail.html",data = data)

